Update devDependencies

* @babel/cli                       ^7.13.14  →  ^7.13.16
* @babel/core                       ^7.14.0  →   ^7.14.2
* @babel/preset-env                 ^7.14.1  →   ^7.14.2
* @rollup/plugin-commonjs           ^18.0.0  →   ^19.0.0
* @rollup/plugin-node-resolve       ^11.2.1  →   ^13.0.0
* clean-css-cli                      ^5.2.2  →    ^5.3.0
* eslint                            ^7.23.0  →   ^7.26.0
* eslint-config-xo                  ^0.35.0  →   ^0.36.0
* eslint-plugin-import              ^2.22.1  →   ^2.23.0
* eslint-plugin-unicorn             ^29.0.0  →   ^31.0.0
* glob                               ^7.1.6  →    ^7.1.7
* hugo-bin                          ^0.70.0  →   ^0.71.1
* node-sass                          ^5.0.0  →    ^6.0.0
* postcss                            ^8.2.9  →   ^8.2.15
* qunit                             ^2.14.1  →   ^2.15.0
* rollup                            ^2.44.0  →   ^2.47.0
* stylelint                        ^13.12.0  →  ^13.13.1
* stylelint-config-twbs-bootstrap    ^2.1.0  →    ^2.2.0
* vnu-jar                            21.2.5  →    21.4.9

.eslintrc.json

@@ -4,7 +4,7 @@
     "plugin:import/errors",
     "plugin:import/warnings",
     "plugin:unicorn/recommended",
-    "xo/esnext",
+    "xo",
     "xo/browser"
   ],
   "rules": {
@@ -52,6 +52,7 @@
     "unicorn/prefer-dom-node-remove": "off",
     "unicorn/prefer-includes": "off",
     "unicorn/prefer-math-trunc": "off",
+    "unicorn/prefer-module": "off",
     "unicorn/prefer-number-properties": "off",
     "unicorn/prefer-optional-catch-binding": "off",
     "unicorn/prefer-query-selector": "off",